Rotary pump.



A. J. RUST.

ROTARY PUMP.

APPLICATION rum) JULY 24, 1911.

Patented Jan114,1913.

MVP/7727f M v 2 SHEETS-SHEET 1.

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A. J. RUST.

ROTARY PUMP.

' APPLICATION FILED JULY 24, 1911.

Patented Jan. 14,1913.

'2 SHEETS-SHEET 2.

IIIIIIIIIII VII/III] To all whom z't-may concern:

. UNITED srnrngfp ENT Y ALBERT J. 'DFVWILLIAYMS, CALIFORNIA.

' sonar PUMP. f

, the following is a specification.

My invention relates more particularly 'to rotary pumps for compressing air but may be used for pumping other gases orrfluids and the object thereof is to provide a pump of simple construction and great efiiciency and in which ample provision is- Made for taking up any wear on the parts.

A further object is to provide means to circulate a small quantity of oil through the pumping chamber whereby a film of oil is maintained on the contact surfaces of moving parts and also on the partswith which the moving parts contact whereby such film of oil forms a frictionless packing thereby making the contacts airtight.

I accomplish this object by means of the mechanism described herein and illustrated in the accompanying drawings, in which Figure 1 is a section on the line vl -.l of

" Fig. 2. Fig. 2 is a section on the line 2-2 of Fig. 1. Fig. 3 is a section on the line 33 of Fig. 1. Fig. d is a section on the line H of Fig. 3. Fig. 5 are detail views of the piston bladesshowing an edge'and a side view respectively with one blade in section. Fig. 6 are detail views of the packing of the piston blades, being an edge and a side view thereof.

In the drawings I have illustrated my machine as designed for pumping air and will describe it as applied to that use. I have illustrated the pump as designed to be attached to a vertical surface but it is equally adapted for attachment to any other surface, but if attached to any other surface the position of the parts shown in the drawings must be preserved to produce the best results in the circulation of the oil. If used for pumping liquids the oil circulating feature chamber 11. At one side of the pumping chamber, which as illustrated is the right hand side, when the pump is positioned for use is the oil supply chamber 12. These chambers are connected by a channel 13 which when the pump is positioned for use Specification of Letters Intent. Application filed July 24, 1911. -Be'rlal N0. 640,179-

Patented Jan.14,1913.

leads'out of" the oil chamber near the top thereof as best shown in Fig. 2.

Mounted in the pumping chamber and eccentric to the center thereof is the pumping piston ld which is circular and preferably hollow. On .one side of the piston and connected thereto, being preferably cast integral therewith, is an operating shaft 15 which pro ects through a boss 16 on the side of the chamber casing. Adjacent the pumping chamber the operating shaft tapers for a short distance, say about 9; its length as best shown in Fig. 1. The remainder of theshaft within the boss is preferably of the same diameter. Exterior the boss the union.

shaft is preferably reduced in diameter and on this reduced portion is mounted the driving pulley 17 to which power is applied to rotate the shaft.

Surrounding the piston shaft within the boss is the shaft adjuster 18. The shaft is positioned eccentric to the center of the adjuster as best shown in Fig. 3. The inner end of the bore of the adjuster has a taper to fit that portion of the shaft next the piston. The diameter of the outer end of the bore of the adjuster is uniform and the intermediate portion tapers inwardly as best shown in Fig. 1. These configurations permit of the wear being taken up. The upper portion of the adjuster isprovided with a multilated Worm gear 19 which meshes with a worm 20 on shaft 21, which shaft is mounted in the casing as best shown in Fig. 3. Inthe end of this shaft is a slit 22 in which is received the end of a screw driver or other tool to rotate the shaft when desired. A lock-nut 28 locks the shaft in its adjusted position.

Surrounding the piston shaft within the adjuster is an adjusting cone-shaped washer 24 which is adjusted by means of nut 25 which is screwed on the shaft. A lock nut 26 holds nut 25 in its adjusted position. The piston is provided with four radial slots 27 in which are mounted piston blades 28. The opposed piston blades are connected by connecting rods or bolts 29 which permit the blades to contract to the smallest diameter. On these bolts are mounted springs 30 which hold the blades in contact with the periphery of the pumping chamber. In the outer ends of the blades are mounted contact wearing rockers 31 which are circular in cross section with an arc. cut ofi one side for the wearing surface, which contacts with the perimeter of the pumping chamber. 'The ends of the blades have circular shaped grooves 32' unto which these rockers are received In one end of the pumping chamber s the air inlet port 33 which is referably triangular shaped as shown in igs 2 and 3.. On the opposite side of the pumplngchamber is the discharge port 34 from which the air is led to' its place of storage or use. Between these ports and at the bottom ef the chamber the piston touches the perimeter of the umping chamber. iA relief oove 35 in t e casing extends from the e ge of this contact to a point above the bottom of the inlet ort so that as the piston blades are move a vacuum is not produced behind them. The inlet ort is inclosed on its outer side by a horn s aped casing 36 epen at the top. This casing prevents anyoil escaping from the pump. Extending from r the bottom of the oil chamber is the feed I have provided grooves 51' in the pipe 37 which passes out of the oil chamber through the top thereof and runs to and enters valve chamber 38 best shown in Fi i. A valve 39 controls the flow of oil out o the valve chamber. From the valve chamber the oil flows through .ort 40 and drops through the sight feed chamber l1 and passes through an L-shaped supply channel 42 to the piston shaft.

From the piston shaft the oil passes through a port 453 in the adjuster and into an L-shaped exhaust channel 44. which opens into the air inlet and is carried by the air into the pumping chamber where it is carried around by the piston blades, thereby lubricating the piston and the walls of the pumping chamber, on all of which parts it is deposited in a thin film which makes a frictionless packing bet-ween the moving parts. All surplus oil is thrown out into the discharge passage from which it drains back into the Oll chamber. Should any oil work outwardly on the operating shaft or on the outside of the adjuster it will be prevented from escaping by the packing gland 45 in which gland is located a shaft packing gland 46. There is a small space between packing gland 45 and the end of the aduster through which the oil can drop. A channel 47 1n the adjuster connects with channel 4A. A port 48 closed by plug 49 provides means to drain the oil out of the oil chamber when desired. A sight chamber 50 is connected to the oil chamber to enable the operator to know how much oil is in the chamber. The oil is fed into the pump through the air inlet.

To provide for wear on the piston blades piston. In these grooves are packing strips 52 which are held in contact with the blades by springs 53 thereby keeping the joint between the blade and the piston always tight. The

thea

end of the pum ingchamber o posite the piston shaft is osed by a hea 54: which can be screwed farther in to take up any wear on the ends of the chamber. It is held positioned by lock nut 55. As the adjuster is revoluble in the boss of the pum in chamber, and as the operating shaft w i carries the pumpin piston ismounted in the adjuster eccentric to its center it is obvious that the rotation of the adjuster will carry the pumping piston toward or away from the perimeter of the pum ing chamber thereby enabling the iston to adjusted to take up the wear. fiy this construction it will be observed that a circulation of oil is constantly maintained through the, ump which not only keeps all the parts pe ectly lubricated but also forms a frictionless pack- I ing between the walls of thepumping chamber and the piston and its blades.v

Having described my invention, what I claim is:

1. The combination with a fluid compression pump, of an oil reservoir connected at its top with the compression chamber and an oil way leading from the bottom of said reservoir through the'bearings of the machine and terminating in the suction of the pump.

2. A rotary pump comprising a casing,

having a cylindrlcal pumping chamber therein with an inlet and an outlet port ad jacent to each other; a circular piston mounted in said chamber eccentric to the center thereof and contacting with the perimeter between said ports, said piston having a lurality of radial slots therein, said s ots eing two or a multiple, thereof; piston blades slidably mounted in said slots, said blades having circular grooves in the outer ends thereof and holes in the opposing faces of each pair; contact rockers mounted in the grooves in the ends of said blades; connecting rods connecting opposed blades, said rods entering the holes in said blades; springs on said rods; means to-adjust the end wear on the pumping chamber and the wear of the piston blades which contact therewith; an'oil chamber connected to the pumping chamber near the outlet port; a pipe leading from the bottom of said oil chamber and carrying oil to a valve chamber; a valve chamber, a valve in said chamber;- a sight feed chamber connected to the valve chamber, a channel leading to the operating shaft; and an exhaust channel leading from the operating shaft to the said boss; a circular piston having 0 erat- In witness that I claim the foregoing I ing blades and mounted in the cham r to have hereunto subscribed my name this 14th contact with the perimeter of the chamber day of July, 1911.

between said ports; an operating shaft se- ALBERT J. RUST.-

cured to said piston and projecting through Witnesses: the said boss and through the adjuster ec- G. E. HARPHAM,

centrically t0 the center of the adjuster. FRANK WATERFIELD. 

